Interesting analysis -- see the post for details
In my opinion the main difference between the Dot Com Boom and the Web 2.0 Boom is who will get hurt when the bubble bursts. During the Dot Com Boom those companies took their IPOs to the NASDAQ where small individual investors were left holding the bag. Today these companies are not public. The VCs and acquiring companies will be hurt when the Web 2.0 bubble bursts.